[pkg-cryptsetup-devel] UUID in fstab for device mapper devices?

[Guido Günther]

On Sat, Aug 08, 2009 at 04:03:38PM +0200, Max Vozeler wrote:
> Hi all,
> 
> Attempt to summarize the discussion so far (please correct): 
> 
>  1) We should use /dev/mapper/ paths rather than UUID in the fstab 
>     entries for all device mapper devices.
> 
>  2) For some type of device mapper devices (multipath), using the 
>     /dev/disk/by-id/ symlinks would be better than /dev/mapper/.
The last point only makes sense if we work on a stable device naming
with _and_ without multipath. I think Novell does this with
/dev/disk/by-id/scsi-XXXXX-partY.  This points to the underlying block
device(s) (e.g. /dev/sda1) without multipath and points to
/dev/mapper/<wwwid>-partY when turning on multipath. 

Looking at /dev/disk/by-uuid/ also seems to do the trick: it points to
/dev/sdaY without and to /dev/mapper/<wwid>-partY with multipath. So if
we'd use this turning multipath on and off would be transparent to the
user.
What's the reasoning for using UUID= instead of /dev/disk/by-uuid/ in
fstab? Non udev systems?
Cheers,
 -- Guido